Battery bottom protection plate

Abstract

The present application relates to the field of new energy, and discloses a battery bottom protection plate, comprising an impact release layer, a first fiber-reinforced resin layer, a metal layer, an impact absorption layer and a second fiber-reinforced resin layer. The first fiber-reinforced resin layer, the metal layer and the second fiber-reinforced resin layer are all arranged between the impact release layer and the impact absorption layer. The impact release layer, the first fiber-reinforced resin layer, the metal layer, the second fiber-reinforced resin layer, and the impact absorption layer are stacked. The present application has the beneficial effects: the battery bottom protection plate adopts a design concept of gradient energy absorption, and has high impact resistance; in addition, a multi-layer composite structure can be produced by means of separate processes, thereby reducing the dissipation of heat between layers, improving the interface adhesion force, improving the reliability of the bottom protection plate, ensuring the protection function of the bottom protection plate, and achieving a good protection effect on a battery pack.

Description

Battery bottom guard plate TECHNICAL FIELD

[0001] The application relates to the field of new energy, in particular to a battery bottom guard plate. BACKGROUND

[0002] With the rapid development of the new energy vehicle market, the safety performance of new energy electric vehicles has become the focus of consumers, wherein the bottom guard plate as an important component of the electric vehicle is directly related to the overall performance of the vehicle and the safety of passengers. The bottom guard plate of the new energy electric vehicle is a protective device installed at the bottom of the electric vehicle and is mainly used for protecting key components such as the battery pack and the motor from impact and damage by external objects. The existence of the bottom guard plate can not only improve the safety performance of the electric vehicle but also improve the driving stability, waterproof and dustproof capability and the like to a certain extent. At present, the material scheme of the bottom guard plate has gradually changed from the traditional metal plate + polyvinyl chloride (PVC) anti-corrosion coating scheme to a product scheme combining a higher-impact metal plate and a composite material, wherein the steel-plastic composite plate is a typical representative. The steel-plastic composite plate can avoid the penetrating damage of the bottom guard plate when subjected to external impact, but still has a large deformation amount and cannot avoid the deformation of the liquid cooling plate and the battery cell above the bottom guard plate, and still has a large safety hazard. Therefore, a new type of battery bottom guard plate is urgently needed to solve the above problems. SUMMARY

[0003] The purpose of the application is to provide a battery bottom guard plate to improve the impact resistance and reliability of the bottom guard plate.

[0004] The purpose of the application is achieved by the following technical scheme:

[0005] A battery bottom guard plate comprises an impact release layer, a first fiber reinforced resin layer, a metal layer, an impact absorption layer and a second fiber reinforced resin layer, the first fiber reinforced resin layer, the metal layer and the second fiber reinforced resin layer are arranged between the impact release layer and the impact absorption layer, and the impact release layer, the first fiber reinforced resin layer, the metal layer, the second fiber reinforced resin layer and the impact absorption layer are arranged in a stack.

[0006] In some embodiments of the application, the first fiber reinforced resin layer and the second fiber reinforced resin layer are respectively arranged on both sides of the metal layer.

[0007] In some embodiments of the application, a first adhesive layer and a second adhesive layer are further included, the first adhesive layer is arranged between the first fiber reinforced resin layer and the metal layer, and the second adhesive layer is arranged between the metal layer and the second fiber reinforced resin layer.

[0008] In some embodiments of the present application, the impact release layer is located above the impact absorption layer, and the thickness of the impact release layer is not greater than the thickness of the impact absorption layer.

[0009] In some embodiments of the present application, the thickness of the impact release layer is 0.1mm-1mm, and the thickness of the impact absorption layer is 0.2mm-2mm.

[0010] In some embodiments of the present application, the first fiber reinforced resin layer is located above the second fiber reinforced resin layer, and the thickness of the first fiber reinforced resin layer is not greater than the thickness of the second fiber reinforced resin layer.

[0011] In some embodiments of the present application, the thickness of the first fiber reinforced resin layer is 0.1mm-1mm, and the thickness of the second fiber reinforced resin layer is 0.2mm-2mm.

[0012] In some embodiments of the present application, the impact release layer is located above the impact absorption layer, the first fiber reinforced resin layer is located above the second fiber reinforced resin layer, a third adhesive layer or surface treatment bonding is provided between the impact release layer and the first fiber reinforced resin layer, and a fourth adhesive layer or surface treatment bonding is provided between the impact absorption layer and the second fiber reinforced resin layer.

[0013] In some embodiments of the present application, the thickness of the first adhesive layer and the second adhesive layer is 0.04mm-0.2mm.

[0014] In some embodiments of the present application, the impact release layer and the impact absorption layer are both polyurea materials.

[0015] The battery bottom guard plate of the present application is based on the steel-plastic composite plate of the metal layer combined with the fiber reinforced resin layer, and adds the impact release layer and the impact absorption layer. The impact absorption layer is located on the outer side and can absorb part of the impact force. The impact force passing through the impact absorption layer is further absorbed by the metal layer and the fiber reinforced resin layer, and the residual impact force is released by the impact release layer, thereby realizing the design concept of gradient energy absorption of the battery bottom guard plate, having high impact resistance, and at the same time, the multi-layer composite structure can be produced through separate processes, reducing heat dissipation between layers, improving interface adhesion, improving the reliability of the bottom guard plate, ensuring the protection function of the bottom guard plate, and playing a good protection role on the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0016] FIG. 1 is a structural schematic diagram of the battery bottom guard plate of the present application;

[0017] FIG. 2 is a structural schematic diagram of Comparative Example 1 of the present application.

[0018] In the figure, 1, impact release layer; 2, first fiber reinforced resin layer; 3, metal layer; 4, impact absorbing layer; 5, second fiber reinforced resin layer; 6, first adhesive layer; 7, second adhesive layer; 8, honeycomb buffer layer. DETAILED DESCRIPTION

[0019] The specific embodiments of the present application will be further described in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0020] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like used in the present application indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0021] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the connection or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] As shown in Figure 1, the first aspect of the embodiment of the present application proposes a battery bottom guard plate, comprising: an impact release layer 1, a first fiber reinforced resin layer 2, a metal layer 3, an impact absorbing layer 4 and a second fiber reinforced resin layer 5, the first fiber reinforced resin layer 2, the metal layer 3 and the second fiber reinforced resin layer 5 are arranged between the impact release layer 1 and the impact absorbing layer 4, and the impact release layer 1, the first fiber reinforced resin layer 2, the metal layer 3, the second fiber reinforced resin layer 5 and the impact absorbing layer 4 are arranged in a stack.

[0023] Based on the above technical scheme, the battery bottom guard plate in the application is based on the steel-plastic composite plate using the metal layer 3 and the fiber reinforced resin layer, and the impact release layer 1 and the impact absorption layer 4 are added. The impact absorption layer 4 is arranged on the outer side and can absorb part of the impact force. The impact force passing through the impact absorption layer 4 is further absorbed by the metal layer 3 and the fiber reinforced resin layer. The residual impact force reaches the impact release layer 1 and is released, thereby realizing the design concept of gradient energy absorption of the battery bottom guard plate, having high impact resistance, and the multilayer composite structure can be produced through a separate process, reducing heat dissipation between layers, improving the interfacial adhesion, improving the reliability of the bottom guard plate, and ensuring the protection function of the bottom guard plate.

[0024] The impact release layer 1 and the impact absorption layer 4 belong to the high polymer material class, and the density range is between 0.9 g / cm 3 -2.0 g / cm 3 , the tensile strength is ≥5 MPa, the tear strength is ≥60 N / mm, and the elongation at break is ≥50%. The properties of the impact layer before compounding can be a film material, a plate material or a liquid. The thickness range of the film material and the plate material is 0.05 mm-5.0 mm, the solid content of the liquid is ≥70%, and the volatile content is <250 g / L. The pulling force (i.e. the pulling strength) between the impact layer and the adjacent fiber reinforced resin layer is ≥5 MPa. The optional types include but are not limited to the following types: polyurethane, polyurea, ethylene propylene diene rubber (EPDM), ethylene, vinyl acetate random copolymer (EVA), styrene-butadiene-styrene block copolymer (SEBS), ethylene-octene random copolymer thermoplastic elastomer (POE), etc. The processing temperature range of the film material and the plate material is 80℃-250℃, and the liquid impact layer can be adhered to the upper fiber reinforced resin layer and the lower fiber reinforced resin layer by a spraying process. The viscosity of the liquid impact layer is ≤1000 mpa.s (25℃) (the viscosity test standard is ASTM D2196-99), and the gel time is ≤168 h. In addition, the metal layer is a steel plate, and the outer surface of the steel plate is provided with a zinc plating layer, a zinc-iron alloy plating layer or an electrophoretic paint protective layer. The impact release layer 1 and the impact absorption layer 4 formed in the above manner can better weaken the impact force sent to the battery pack, thereby realizing the protection function of the bottom guard plate.

[0025] In some embodiments of the present application, as shown in FIG. 1, the first fiber reinforced resin layer 2 and the second fiber reinforced resin layer 5 are respectively arranged on both sides of the metal layer 3. The first fiber reinforced resin layer 2 and the second fiber reinforced resin layer 5 are thermoplastic composites, which are composed of fiber products and thermoplastic resins, and the fiber content is 30wt%-85wt%. The fiber products are one or more combinations of alkali-free glass fiber, medium alkali glass fiber, or high alkali glass fiber, carbon fiber, aramid fiber, basalt fiber, or silicon carbide fiber; the fiber product forms one or more combinations of fiber felt, square cloth (plain cloth, twill cloth, or satin cloth), or multi-axial fabric, and the fiber diameter is 5-20μm. The thermoplastic resin is composed of 15%-70% (mass percentage) polyolefin resin, 0-20% (mass percentage) auxiliary agent, and 0-10% (mass percentage) filler (such as talc, calcium carbonate, barium sulfate, wollastonite, or mica). The selected resin matrix has a melt index in the range of 10-100g / 10min. The polyolefin resin is one or more of polyethylene, polypropylene, and polyethylene recyclates, or polypropylene recyclates in any ratio (for example, polyethylene and polypropylene in a mass ratio of 1:1, 1:2, or 1:3). The auxiliary agent includes one or more combinations of a compatibilizer (preferably a reactive compatibilizer, such as a maleic anhydride grafted modified high molecular material or an olefin copolymer), an antioxidant (such as a phenolic antioxidant, a phosphorus antioxidant, or a sulfur ester auxiliary antioxidant), a lubricant (such as a hydrocarbon wax, or a fatty acid and its derivative), an anti-dripping agent (such as a high molecular anti-dripping agent), a plasticizer (such as phthalic acid ester), a coupling agent (such as silane or titanate), an anti-aging agent (such as a hindered amine light stabilizer or an ultraviolet absorber), a flame retardant (such as a nitrogen-based flame retardant or a phosphorus-nitrogen intumescent flame retardant), and other functional additives. The first fiber reinforced resin layer 2 and the second fiber reinforced resin layer 5 are arranged in combination with the above components, which can better absorb impact force.

[0026] Specifically, as shown in FIG. 1, the first adhesive layer 6 and the second adhesive layer 7 are further included, the first adhesive layer 6 is arranged between the first fiber reinforced resin layer 2 and the metal layer 3, and the second adhesive layer 7 is arranged between the metal layer 3 and the second fiber reinforced resin layer 5. The functions of the first adhesive layer 6 and the second adhesive layer 7 are to stably and firmly connect the metal layer 3 with the fiber reinforced resin layers on both sides, thereby improving the reliability of the underbody shield.

[0027] In some embodiments of the present application, as shown in FIG. 1, the impact release layer 1 is located above the impact absorbing layer 4, and the thickness of the impact release layer 1 is not greater than the thickness of the impact absorbing layer 4. One side of the impact release layer 1 is close to the internal structure of the battery pack, and one side of the impact absorbing layer 4 is close to the outside. Since the impact absorbing layer 4 directly faces the impact force, it needs a larger thickness to resist impact, while the impact release layer 1 located at the innermost side can adopt a smaller thickness to balance the lightweight of the bottom protection plate.

[0028] Specifically, as shown in FIG. 1, the thickness of the impact release layer 1 is 0.1mm-1mm, and the thickness of the impact absorbing layer 4 is 0.2mm-2mm. On the basis that the thickness of the impact release layer 1 is not greater than the thickness of the impact absorbing layer 4, the two with the above thicknesses can better balance the impact resistance and lightweight. More preferably, the thickness of the impact release layer 1 is 0.5mm, and the thickness of the impact absorbing layer 4 is 1mm.

[0029] In some embodiments of the present application, as shown in FIG. 1, the first fiber reinforced resin layer 2 is located above the second fiber reinforced resin layer 5, and the thickness of the first fiber reinforced resin layer 2 is not greater than the thickness of the second fiber reinforced resin layer 5. Similar to the thickness setting of the impact release layer 1 and the impact absorbing layer 4, the first fiber reinforced resin layer 2 is closer to the inside of the battery pack than the second fiber reinforced resin layer 5, so the thickness of the first fiber reinforced resin layer 2 is smaller, and the lightweight effect is good, and the thickness of the second fiber reinforced resin layer 5 is larger, and the impact resistance is good.

[0030] Specifically, as shown in FIG. 1, the thickness of the first fiber reinforced resin layer 2 is 0.1mm-1mm, and the thickness of the second fiber reinforced resin layer 5 is 0.2mm-2mm. On the basis that the thickness of the first fiber reinforced resin layer 2 is not greater than the thickness of the second fiber reinforced resin layer 5, the two with the above thicknesses can better balance the impact resistance and lightweight. More preferably, the thickness of the first fiber reinforced resin layer 2 is 0.6mm, and the thickness of the second fiber reinforced resin layer 5 is 1mm.

[0031] In some embodiments of the present application, as shown in FIG. 1, the impact release layer 1 is located above the impact absorption layer 4, the first fiber reinforced resin layer 2 is located above the second fiber reinforced resin layer 5, a third adhesive layer is provided between the impact release layer 1 and the first fiber reinforced resin layer 2 or the interface is treated by surface treatment, and a fourth adhesive layer is provided between the impact absorption layer 4 and the second fiber reinforced resin layer 5 or the interface is treated by surface treatment. In some embodiments of the present application, the third adhesive layer and the fourth adhesive layer are composed of a high molecular resin layer composed of polypropylene, an additive, and an adhesive in a certain proportion. In some embodiments of the present application, the mass ratio of polypropylene, the additive, and the adhesive is (80-68):(18-12):(15-8) or other mass ratios. In some embodiments of the present application, the mass ratio of polypropylene, the additive, and the adhesive is 75:15:10. In some embodiments of the present application, the additive is a polyolefin elastomer (POE). In some embodiments of the present application, the adhesive is a maleic anhydride grafted modified polypropylene.

[0032] Specifically, as shown in FIG. 1, the thickness of the first adhesive layer 6 and the second adhesive layer 7 is 0.04mm-0.2mm. More preferably, the thickness of the first adhesive layer 6 and the second adhesive layer 7 is 0.1mm, which can balance the bonding strength and the lightweight requirement. In some embodiments of the present application, the first adhesive layer 6 and the second adhesive layer 7 are composed of a high molecular resin layer composed of polypropylene, an additive, and an adhesive in a certain proportion. In some embodiments of the present application, the additive is a polyolefin elastomer (POE). In some embodiments of the present application, the adhesive is a maleic anhydride grafted modified polypropylene. In some embodiments of the present application, the typical mass ratio of polypropylene, the additive, and the adhesive is (80-68):(18-12):(15-8). In some embodiments of the present application, the mass ratio of polypropylene, the additive, and the adhesive is 75:15:10.

[0033] In some embodiments of the present application, as shown in FIG. 1, the impact release layer and the impact absorption layer are both made of polyurea material. Polyurea is an elastomer material generated by the reaction of isocyanate component and amino compound component, which has the characteristics of corrosion resistance, waterproofness, wear resistance, etc., and can effectively achieve the purpose of impact resistance.

[0034] The second aspect of the embodiments of the present application provides a battery pack, comprising a battery body and the battery bottom guard plate as described above, wherein the battery bottom guard plate is arranged below the battery body. The battery bottom guard plate arranged below the battery body can effectively prevent the impact force from the bottom from damaging the battery body. Since the battery pack comprises the battery bottom guard plate as described above, the battery pack has all the beneficial effects of the battery bottom guard plate as described above, which will not be described here again.

[0035] The preparation method of the bottom guard plate of the present application is described here, which comprises the following steps:

[0036] I. The first fiber reinforced resin layer 2, the metal layer 3 and the second fiber reinforced resin layer 5 are compounded

[0037] 1. Preparation of the fiber reinforced resin layer: After the fiber product is fully impregnated by the melt / solution of thermoplastic resin, it is cooled, cut and rolled to form a fiber reinforced prepreg sheet. The fiber reinforced prepreg sheet is subjected to layer design, high-temperature hot pressing, cooling and other processes to obtain the fiber reinforced resin layer;

[0038] 2. The first fiber reinforced resin layer 2, the first adhesive layer 6, the metal layer 3, the second adhesive layer 7 and the second fiber reinforced resin layer 5 are sequentially unwound and laid together by hand or automatically, and then subjected to high-temperature hot pressing, cooling and setting, length cutting and other processes to obtain a steel-plastic composite plate;

[0039] II. Surface treatment of the product of step I

[0040] The steel-plastic composite plate is subjected to surface treatment by continuous online treatment. The continuous treatment method includes but is not limited to flame treatment, sandblasting, plasma treatment, special reagent treatment, etc.

[0041] III. Compounding or attaching the impact release layer 1 and the impact absorption layer 4

[0042] If the buffer layer is a film or a plate, the upper and lower buffer layers are bonded to the steel-plastic composite plate after surface treatment by hot pressing. If the buffer layer is liquid, the impact layer is bonded to the steel-plastic composite plate by spraying.

[0043] To specifically embody the beneficial effects of the bottom guard plate of the present application, the following examples and comparative examples are provided:

[0044] Example 1:

[0045] The first fiber reinforced resin layer 2 is continuous glass fiber reinforced polypropylene with a glass fiber content of 65% (mass percentage) and a thickness of 0.6 mm. The second fiber reinforced resin layer 5 is continuous glass fiber reinforced polypropylene with a glass fiber content of 65% (mass percentage) and a thickness of 1.0 mm. The thickness of the first adhesive layer 6 and the second adhesive layer 7 is 0.1 mm. The metal layer 3 is a galvanized DP780 steel plate with a thickness of 0.8 mm. The impact absorbing layer 4 is a slow-drying polyurea with a density of 1.1 g / cm 3 , a tensile strength of 8.0 MPa, a tear strength of 70 N / mm, an elongation at break of 350%, and a thickness of 1.0 mm. The impact releasing layer 1 is a slow-drying polyurea with a density of 1.1 g / cm 3 , a tensile strength of 8.0 MPa, a tear strength of 70 N / mm, an elongation at break of 350%, and a thickness of 0.5 mm. The viscosity of the upper and lower impact layers (i.e., the impact releasing layer 1 and the impact absorbing layer 4) is 500 mpa.s (25°C), and the gel time is 2 h. Before spraying the upper and lower impact layers, the surface of the steel-plastic composite plate is subjected to plasma surface treatment.

[0046] The sample (i.e., the bottom guard plate) is subjected to drum peeling test and impact test to evaluate the impact energy of the material (i.e., the bottom guard plate) with a deformation of 6 mm as the criterion. The impact test uses a drop hammer impact test method, which includes locking the sample on the test tool with 4 points, and the distance between the locking points is 250 mm.

[0047] Comparative Example 1:

[0048] As shown in FIG. 2, a protective plate with a buffer layer includes a first fiber reinforced resin layer 2, a first adhesive layer 6, a metal layer 3, a second adhesive layer 7, a honeycomb buffer layer 8, and a second fiber reinforced resin layer 5 arranged in sequence.

[0049] The first fiber reinforced resin layer 2 (upper fiber reinforced layer) is continuous glass fiber reinforced polypropylene with a glass fiber content of 65% (mass percentage) and a thickness of 1.0 mm. The second fiber reinforced resin layer 5 (lower fiber reinforced layer) is continuous glass fiber reinforced polypropylene with a glass fiber content of 65% (mass percentage) and a thickness of 1.0 mm. The thickness of the first adhesive layer 6 and the second adhesive layer 7 is 0.1 mm, and the material of the first adhesive layer 6 and the second adhesive layer 7 is resin. The metal layer 3 is a galvanized DP780 steel plate with a thickness of 0.8 mm. The honeycomb buffer layer 8 is made of polypropylene with a thickness of 7 mm and a honeycomb tube diameter of 8.0 mm.

[0050] The sample (i.e. the backplate) was subjected to a drum peel test and an impact test, the drum peel test was performed according to GB / T 1457-2005 Method of test for interlayer bonding strength by drum peel (an analogous international standard is ISO 4578) with a deformation of 6mm as the criterion, to evaluate the impact energy of the material (i.e. the backplate). The impact test was performed according to a falling weight impact test method, including clamping the sample on a test fixture with 4 points, the distance between the clamping points was 250mm.

[0051] The specific test data comparison table is as follows:

[0052] Table 1 Example 1 Comparative Example 1 Data Comparison Table

[0053] The test standards of the impact layer (impact release layer and impact absorption layer) of the present application are as follows:

[0054] Solid content: GB / T 1725 (an analogous international standard is ISO 3251);

[0055] Density: GB / T 6750 (an analogous international standard is ISO 2811; an analogous American standard is ASTM D1475);

[0056] Tensile strength (tensile force): GB / T 5210 (an analogous international standard is ISO 4624; an analogous American standard is ASTM D4541)

[0057] Impact resistance: GB / T 1732 (an analogous American standard is ASTM D2794)

[0058] Volatile content: GB / T 37884-2019 (an analogous American standard is ASTM D2369)

[0059] Tensile strength: GB / T 528 (an analogous international standard is ISO 37; an analogous American standard is ASTM D412)

[0060] Tear strength: GB / T 529 (an analogous international standard is ISO 34-1)

[0061] Elongation at break: GB / T 528 (an analogous international standard is ISO 37; an analogous American standard is ASTM D412)

[0062] Falling weight impact: hammer head diameter d = 25mm, base support area r = 30mm (circular), 600J impact energy, lower impact absorption layer, observe the deformation of the backplate or the backplate.

[0063] From the above data comparison table, it can be seen that the bottom protection plate of Example 1 can withstand greater impact energy and greater drum peeling strength under the premise of smaller thickness, which shows that the bottom protection plate of Example 1 can better realize the bottom protection function of the battery pack compared with the protection plate of Comparative Example 1.

[0064] In summary, the battery bottom protection plate of the present application, on the basis of using a metal layer 3 combined with a fiber reinforced resin layer, adds an impact release layer 1 and an impact absorption layer 4. The impact absorption layer 4 is arranged on the outer side and can absorb part of the impact force. The impact force passing through the impact absorption layer 4 is further absorbed by the metal layer 3 and the fiber reinforced resin layer. The residual impact force reaches the impact release layer 1 and is released, thereby realizing the design concept of gradient energy absorption of the battery bottom protection plate, having high impact resistance, and the multi-layer composite structure can be produced through separate processes, reducing heat dissipation between layers, improving interface adhesion, improving the reliability of the bottom protection plate, ensuring the protection function of the bottom protection plate, and can play a good protection role for the battery pack.

[0065] The above is only the preferred embodiment of the present application. It should be noted that for those skilled in the art, without departing from the technical principles of the present application, several improvements and substitutions can be made, which should also be considered as the protection scope of the present application.

Claims

1. A battery undertray characterized by, Comprise: An impact release layer, a first fiber reinforced resin layer, a metal layer, an impact absorbing layer, and a second fiber reinforced resin layer, the first fiber reinforced resin layer, the metal layer, and the second fiber reinforced resin layer are all arranged between the impact release layer and the impact absorbing layer, and the impact release layer, the first fiber reinforced resin layer, the metal layer, the second fiber reinforced resin layer, and the impact absorbing layer are laminated.

2. The battery under-shield of claim 1, wherein, The first fiber reinforced resin layer and the second fiber reinforced resin layer are respectively arranged on both sides of the metal layer.

3. The battery undertray of claim 2, wherein, Further comprise a first adhesive layer and a second adhesive layer, the first adhesive layer is arranged between the first fiber reinforced resin layer and the metal layer, and the second adhesive layer is arranged between the metal layer and the second fiber reinforced resin layer.

4. The battery under-shield of claim 1, wherein, The impact release layer is above the impact absorbing layer, and the thickness of the impact release layer is not greater than the thickness of the impact absorbing layer.

5. The battery undertray of claim 4, wherein, The thickness of the impact release layer is 0.1mm-1mm, and the thickness of the impact absorbing layer is 0.2mm-2mm.

6. The battery undertray of claim 2, wherein, The first fiber reinforced resin layer is above the second fiber reinforced resin layer, and the thickness of the first fiber reinforced resin layer is not greater than the thickness of the second fiber reinforced resin layer.

7. The battery undertray of claim 6, wherein, The thickness of the first fiber reinforced resin layer is 0.1mm-1mm, and the thickness of the second fiber reinforced resin layer is 0.2mm-2mm.

8. The battery under-shield of claim 2, wherein, The impact release layer is above the impact absorbing layer, the first fiber reinforced resin layer is above the second fiber reinforced resin layer, a third adhesive layer is arranged between the impact release layer and the first fiber reinforced resin layer or is bonded by surface treatment, and a fourth adhesive layer is arranged between the impact absorbing layer and the second fiber reinforced resin layer or is bonded by surface treatment.

9. The battery undertray of claim 3, wherein, The thickness of the first adhesive layer and the second adhesive layer is 0.04mm-0.2mm.

10. The battery undertray of claim 1, wherein, The impact release layer and the impact absorbing layer are both polyurea materials.

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